[CMake] Check that a certificate for lldb is present at build time.
[CMake] Check that a certificate for lldb is present at build time.

Reviewers: JDevlieghere, sgraenitz, aprantl, friss

Subscribers: mgorny, lldb-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D63745

git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@364334 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb